Nice graphic. Perhaps you need to add a blind ( decorative } rivit head at the point of your red arrow to make it clear that the rivit head you see on the outside of the tail isn't the same as the one securing the leather . Except at the top and bottom of the articulated section. Although the center strap isn't strictly speaking necessary the assumption is that the springiness of the leather helped the lames to fold in an orderly fashion and not get stuck or rattle around.
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